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Jim Gillilan's Custom 1322 Carbine

Jim Gillilan's Custom 1322 Carbine w/Custom Stock

Here's one I'm especially proud of and is modded all over, doing 12fpe at 15 pumps.
Stock is Teak from Thailand and super light weight 1322 Carbine!

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I think we've been talking about different things

April 19 2017 at 4:50 PM

CO222  (Login CO222)
Crosman Forum Member
from IP address

Response to A Modest Proposal: I think the recent discussion of pump link length...

I've been concerned with the effect of the B/L ratio per your nomenclature:
not the B/A ratio (which does change as B/L changes, but it's determined by B/L and the intended stroke length)

Every one of my graphed examples covering B/L ratios from 1.333 to 5.0 shares the same precisely 150 mm stroke (therefore same volume).
If I'm analysing a ratio that doesn't give the correct stroke then I simply scale the overall lengths so that it does.

I also keep the same point of effort, which is set at 400 mm, and same arc of 135 degrees - covering points #1 & #3.


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